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  • Other Sources  (3)
  • 1970-1974  (3)
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  • 1
    Publication Date: 2019-06-27
    Description: Two independent sets of high resolution time series spectra of the Ca II H and K emission obtained at the Solar Tower and at the Big Dome of the Sacramento Peak Observatory on September 11th, 1971 are reported. The evolutionary behavior of the emission first reported by Wilson and Evans is confirmed, but the detail of the evolution is found to be more complex. In one case, a doubly peaked feature showing some K3 emission evolves into a single K2 (red) peak with no K3 emission. Coincidentally, a neighboring doubly peaked feature evolves to a very strong blue peak. In an entirely independent sequence a doubly peaked feature evolves into a single red peak. The K2 emission then fades completely although the continuum threads are still strong. Finally a strong K2 blue peak appears. It is concluded that the observed evolution of the K2 emission is due to temporal variations in the physical conditions which give rise to them.
    Keywords: SPACE SCIENCES
    Type: Solar Physics; 25; July 197
    Format: text
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  • 2
    Publication Date: 2019-06-27
    Description: Review of some of the main features of a high resolution spectroscopy program aimed at the precise photometric observation of chromospheric fine structures using the Sacramento Peak vacuum telescope. The observing procedures are described, and a sample of the first observational results is presented.
    Keywords: SPACE SCIENCES
    Type: AD-751703 , AFCRL-72-0557 , Solar Physics; 25; July 197
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  • 3
    Publication Date: 2019-07-13
    Description: A summary of the proceedings of a conference whose purpose was to explore plasma physics problems which arise in the study of solar physics is provided. Sessions were concerned with specific questions including the following: (1) whether the solar plasma is thermal or non-themal; (2) what spectroscopic data is required; (3) what types of magnetic field structures exist; (4) whether magnetohydrodynamic instabilities occur; (5) whether resistive or non-magnetohydrodynamic instabilities occur; (6) what mechanisms of particle acceleration have been proposed; and (7) what information is available concerning shock waves. Very few questions were answered categorically but, for each question, there was discussion concerning the observational evidence, theoretical analyses, and existing or potential laboratory and numerical experiments.
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-140571 , SU-IPR-594 , Sep 17, 1974 - Sep 20, 1974; Stanford, CA; United States
    Format: application/pdf
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